Influence of soil moisture on sweet potato (Ipomoea batatas) growth and yield
1989
Demagante, A.L. | Opena, G.B. | Vander Zaag, P. (International Potato Center, c/o International Rice Research Inst., Los Banos, Laguna (Philippines))
Drought is a severe limitation in many tropical upland and lowland regions where sweet potatoes are grown. Detailed growth and yield analysis of 5 sweet potato cultivars under a range of soil moisture were evaluated in a hot tropical location of the Philippines to gain a better understanding of the response to water stress. Sweet potato genotypes varied in their response to soil moisture. The traditional local varieties Sinuksuk and miracle generally yielded lower at either extreme of soil moisture than the high yielding varieties VSP-3, VSP-4 and VSP-5. Vine growth was slightly reduced with lower soil moisture. Limited storage root dry matter production during the first 110 DAP for miracle and Sinuksuk was primarily due to a slow crop growth rate and late storage root initiation. The high storage root yield of VSP-4 at 160 mm water were due to its earliness to form storage roots, high bulking rate, high diversion of assimilates to the storage roots, and high storage root/leaf and storage root/vine ratio. The results indicate that the sensitivity of sweet potato genotypes to water stress is only critical during the early crop growth stage when full crop cover has not been attained. High storage root yields under limited soil moisture depends more on crop growth, the earliness to form storage roots, sink strength (storage root number), and partitioning of assimilates to the storage roots than on the morphological characters (i.e. leaf area and root growth).
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